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WOW, I Defraged my SSD; not for speed - Page 7  

post #61 of 67
Regenerated indexes FOR THE WIN!!!!!
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post #62 of 67
Thread Starter 
I understand everything about SSD's I agree with everyone, however by defragging a dieing drive, it has been repairing it every time...

Sorry I shared my findings...
    
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post #63 of 67
Thread Starter 
Quote:
Originally Posted by djriful View Post

Just answering directly to OP, you might have experiment a placebo effect. Defrag did improve the SSD speed might have cause by or probably fix be the index table not the file location. The defrag part was a waste but the regenerated index did not.

Wow, now that could be why its doing what its doing... Thank you very much for that information... That explains alot!
    
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post #64 of 67
330
Thank god by the time I got to the bottom of the thread, I no longer had to pull the trigger. Glad everything is sorted out.
    
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post #65 of 67
Thread Starter 
LOL..funny..
    
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post #66 of 67
Quote:
Originally Posted by FEAST View Post

Quote:
Originally Posted by Sean Webster View Post

Edit: Even better explanation. tongue.gif

Why you shouldn't defrag a SSD:
Basically a SSD never needs defragmenting because it doesn't matter where the data is on the drive, they have ~.1 access time to anywhere on the the SSD's NAND cells and is always the same. All defragging does to an ssd is reduce its life by moving the data around on the drive.

There is a difference in defragging a SSD vs a HDD.

With HDDs the OS knows where the data on the HDD. Defrag programs assume that LBA (Logical Block Addresses) are fixed to a specific physical point on the hard disk. for example, LBA=1 is next to LBA=2, which is in turn next to LBA=3, thus when you defrag, it moves adjusts the files locations on the disk's platters where they can be read sequentially to increase the speeds. This is not the case for SSDs as LBAs for flash pages change based on its wear leveling algorithm.

For SSDs since they have flash memory and have a controller that takes care of wear leveling, when you defrag, it is a waste of writes to the drive on the drive, the OS thinks it knows where it is, but it really does not. It simply tells the SSD to read and write the data over in a certain location, but the controller of the SSD actually tells the data where to go. So, the OS does not know how data is being mapped on the SSD, the controller maintains the OS's understanding of the LBA but keeps it own internal LBA map.

Fragmentation is not going to hurt a SSD's speed. As a matter of fact SSDs fragment data on purpose to increase performance through parallel access, fragmentation is a requirement for maximum SSD performance. SSD controllers use multiple channels (typically 8-10) to improve performance (like RAID 0). Fragmenting data helps to ensure best performance. Even if a file is stored in sequential blocks according to its LBA address (ie. the file is not fragmented according to the OS/defrag program), it might be sprawled across several flash chips.

You could have simply done a secure erase and it would have sped the SSD back to stock speeds.

Okay, but if the SSD is fragmenting/spreading the data evenly - then wouldn't de-fragmenting have no effect at all? The data would be just as spread out as before. Is there any benefit to the OS when calling files from sequential digital addresses?

Tell me more about this secure erase you speak of.

Secure erase basically resets your SSD's NAND cells to like new for out of factory performance after a performance loss.

Here is a guide i made for how to run secure erase:

How to: Secure Erase Your SSD! Warning: Spoiler! (Click to show)
This is how to secure a SSD with parted magic. Hopefully this will help out people who have never done it before and can get a little boost in performance after a few months of heavy use.

Secure Erase:
  1. Download parted magic and make a bootable CD or USB: Parted Magic
  2. Once bootable load it and select option 1 (default settings)
    340
  3. Once booted, at the main screen got to Start > System Tools > Erase Disk
    452
  4. Now select the "Internal:Secure Erase command writes zeroes to entire data area" option which will write zeroes to your entire data area" option
    451
  5. Select the disk that you want to secure erase
    373
  6. If you get a message stating that your SSD drive is "frozen," click the Sleep button to put your PC to sleep, then wake up your system and start over from Step 3. If you don't get this message, move on to Step 7.
    217
  7. Some drives indicate that they have a password requirement. Leave the password as "NULL" and click OK.
    312
  8. Now a verify window will pop up, select "Yes" to continue.
    Note: If it prompts you to use the "enhanced" or "advanced" method do not use it, click no, it can write random data, and there is also the possibility that it may access parts of the drive that it shouldn't!
    234
  9. This shouldn't take long on your SSD, most likely only a few seconds. Now you are done.
    95

    Freeze Locked:
    If your SSD is being "Freeze Locked" or not showing up then try this:
    You will get an option to put the PC to sleep, try that first then try to Secure Erase again, if that doesn't work try below:
    1. Reboot
    2. Enable AHCI mode in the UEFI/BIOS and "hot swap" on the SATA ports
    3. Save & exit
    4. Turn off the computer
    5. Unplug EVERYTHING on your SATA ports except for your CD/DVD drive
    6. Turn on and boot to Parted Magic
    7. When in the main GUI plug your SSD into a normal SATA 2 port
      Note: Basically "Freeze Locking" your SSD will not let it be allowed to be Secure Erased. If the UEFI/BIOS recognizes the SSD as plugged in at boot up then it will lock it. If you plug in the SSD after the computer is on then it will not be locked and it should be able to be Secure Erased normally.
post #67 of 67
Well that was fun...

Thread cleaned. Keep all insults and profanity to yourselves please thumb.gif
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